How our physics understanding changes when we move from 2D to 3D measurements in ICF plasmas*

Recent inertial confinement fusion (ICF) measurements have highlighted the importance of 3D asymmetry effects on implosion performance. One prominent example is the bulk drift velocity of the deuterium-tritium plasma undergoing fusion (``hot spot''). Upgrades to the National Ignition Facility neutron time-of-flight diagnostics now provide v$_{\mathrm{bulk}}$ to better than 1 part in 10$^{\mathrm{4}}$, and enable cross-correlations with other measurements. This talk presents the impact of v$_{\mathrm{bulk}}$ on neutron yield, downscatter ratio, apparent ion temperature, electron temperature, and 2D x-ray and neutron emission. The benefits of using cross-diagnostic analysis to obtain 3D views of the plasma is highlighted. A comparison with modeling is made, and future concepts for measuring hot spot flows is presented. This research reflects the growing interest in 3D measurements of the national ICF community.